Just downloaded and installed Delphi 11.1, and all the unit tests passed without a glitch. So I can announce that DWScript is compatible with Delphi 11.1 for Win32 and Win64! You can find links to all the Delphi 11.1 release details on Marco’s blog.
In other news, the tip of the DWScript repository is considered stable, but a round of core changes were made a few days ago. The last stable state just before the round of changes can be found in the DWScript Releases on the GitHub mirror. The next round of changes likely be able to will rip out the stack from the engine, and transition to closures.